Sharp Kabushiki Kaisha Corporation

Hideto Hayasaki

Noritoshi Kako

Yasukuni Yamane

Masaki Takakura

Keisuke Iwasaki

Yoji Noguchi

Hideo Takemura

Kyoya Kawano

Masao Izumi

To provide an authentication system allowing stable determination as to whether a user is a registered user while saving user's trouble, an information processing device capable of data communication with a plurality of image forming apparatuses extracts an image forming apparatus connected to an IC card reader from the plurality of image forming apparatuses, based on reply signals transmitted from the plurality of image forming apparatuses, and transmits user account information of registered users to the extracted image forming apparatus. The image forming apparatus connectable to the IC card reader performs, if it is determined that the IC card reader is connected to the image forming apparatus, the authentication process based on the user account information of registered users received from the information processing device and on the information read by the IC card reader.

Authentication system, terminal and information processing device, having function of performing stable authentication

In color printing, for example, a color image is generally picked up by a color camera, image scanner and is processed by an image processor and a processing result is obtained as a full color image by a color printer. Some color printers use three different color inks of yellow, magenta and cyan and other printers use black in addition to those inks. Black ink is outputted to print a black area of the colored image and allotment of yellow, magenta or cyan inks is formed on at least part of the black area. Allotment and output of each of the color inks onto the black ink is determined by a color matrix table which defines a color ink output rule. The color matrix table also contains matrix elements for not outputting any of the color of inks. The black ink is output in accordance with a dither matrix table which is an array of thresholds defining where to form the black ink dots in the black area of the color image dependently of the color density levels of colors in the colored image so that the double output of the black ink and the level magenta or cyan inks determined by the color matrix is carried out in accordance with the color density levels of the colors in the colored image. In addition the colored inks can be applied onto the black ink dots not only in a color matrix table but also by the use of random numbers, that is by random selection of the colored inks.

Method for printing a color image which includes black ink

An image processing device includes a multipurpose memory which stores intensity information as well as label information and a look-up memory. The output from the multipurpose memory is connected to an address of the look-up table memory and is converted by the look-up table memory. The image processing device operates to select an area in an image without erasing the data of an image to be processed and to change the color at a very high speed.

Image processing device

Growing community of inventors

Osaka, Japan

Hideto Hayasaki